Review on Foto&Tech Rubber EF Eye Cup: Compatible with Canon Rebel T7i T6i T6 T6i T6S T5i T4i T3i T3 T2i T1i XTi XSi XS DSLR, EOS 1100D 600D 550D 500D 450D 400D 350D 300D Camera - Enhance Comfort and Precision! by Ananta Crowley

Age of use: 3 months My original Canon rubber eyecup fell off after 2 years. So we tried swapping out the FotoTech eyecup. The product was delivered quickly, the packaging is minimalist. There are no product guides, but if you're looking for guides then I think Youtube or your camera manual is your best friend. The eyecup fits perfectly in the original groove. The fit and shape of the counterparts must be well thought out. It sticks right in. The rubber eyecup is soft and won't bother you if it presses against your skin when shooting. A good product. Definitely recommended as a replacement